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Debt - Summary of Finance Cost and Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about borrowings [line items] |  |  |
Finance income | $ 17,939 | $ 13,000 | $ 25,947
Finance cost | (35,223) | (37,024) | (33,155)
Interest income on short-term bank deposits [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Finance income | 1,499 | 675 | 3,662
Interest income on investment [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Finance income | 16,440 | 12,325 | 22,285
Interests expense on bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Finance cost | (32,599) | (32,647) | (30,866)
Interest on factoring [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Finance cost | $ (2,624) | $ (4,377) | $ (2,289)

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